Keystones — Lintel
Five GCSE retrieval questions · 27 July 2021 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00023
Answer: 2.3 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² - 8x + 15
Answer: (x - 3)(x - 5) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 18cm, angle = 31°. Find adjacent side
Answer: 15.4cm -
4. Ratio Mixed ratio problems
Simplify: 12:8:20
Answer: 3:2:5 -
5. Statistics Mean
Calculate the mean of: 26, 39, 20, 25, 43, 27, 36
Answer: 30.9